Hydraulic forging press



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(No Model O.DAVY. HYDRAULIC FORGING PRESS.

No. 430,837. Patent-ed June 24, 1890.

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C. DAVY. HYDRAULIC PORGING PRESS.

No. 430,837. Patented June 24, 1890.

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G. DAVY. HYDRAULIC FORGING PRESS.

No. 480,837. Patented June 24, 189.0.

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UNITED STATES PATENT OFFICE,

CHARLES DAVY, OF SHEFFIELD, ENGLAND.

HYDRAULIC FORGlNG-PRESS.

SPECIFICATION forming part of Letters Patent No. 430,837, dated June 24, 1890.

Application filed June 8, 1889. Serial No. 313,586. (No model.)

T at whom it may concern:

Be it known that 1, CHARLES DAVY, engineer, of Park Iron WVorks, Sheffield, in the county of York, England, have invented new and useful Improvements in or connected with Hydraulic Forging-Presses, of which the following is a full, clear, and exact description.

This invention relates to the feed-rollers of a hydraulic forging-press used for operating to on large plate-blooms and other large forgings of simple form, which require to be reduced in thickness by successive squeezings of consecutive portions of their length. In order, that theingot or bloom may be fed I 5 across the anvil into position to be pressed, it

is necessary that while being so fed it be supported on the feeding or ingoing side at a level slightly above that of the top of the anvil. On the other hand, as the part of the inzo got being operated on is compressed, and consequently reduced in thickness-and as such diminution of thickness proceeds equally from the upper and under surfaces while the part not yet operated on remains of the origi- 2 5 nal thickness, at bodily lowering of the ingot takes place in the act of compression, and it is necessary that the feed-rollers should accommodate themselves to this descending motion of the as yet uncompressed portion of 0 theingot.

To this end my invention consists, essentially, in the combination, with the presshead, of a hydraulic forging-press, of a set of feed-rollers movable in the vertical direction 3 5 and upheld by counterbalanceweights or other yielding power, (whereby the ingot will be brought up to and supported at the proper level in relation to the anvil to enable it to be fed over the same,) and of mechanism whereby the press-head in its descent is caused to depress the feed-rollers concurrently with the compression of the ingot, and to an extent exactly corresponding to the bodily descent of the ingot while under compression, such 5 bodily descent being equal to half the amount of the reduction of thickness produced by such compression. Usually there is a set of feed-rollers at each side of the anvil, and the bloom is fed across the anvil alternately from opposite sides, the set of rollers at the outgoing side acting for the time being as receivin g-rollers. When so acting they do not need to be depressed below the level of the anvil, and the mechanism through which the press head can act on them is then thrown out of action. They then remain at a-height at or slightly above the level of the anvil, so as to assist in carrying the ingot, especially the last portion thereof, over the anvil. If slightly above the level of the anvil,they are free to be depressed to the same level as the anvil by the mere pressure on the ingot.

' Reference is to be had to the accompanyin g drawings, forming part of this specification, wherein- Figure l is a longitudinal section on line 1 1, 2, which is a horizontal section on line 2 2; Fig. 3, which-is a vertical section on line 3 3, Fig. 1, of a hydraulic forging-press provided with sets of counterbalanced feed-rollers at each side of the anvil. Fig. 4 is a crosssection on line 4 4, Fig. 1. Fig. 5 is a diagram illustrating in dotted lines the original position of the ingot before being operated on and in full lines the change in form and position of the ingot due to the compression, also the yielding action of the rollers on the ingoing side.

The same letters of reference indicate like parts in all the figures.

A is the anvil, and B the press-head, of a hydraulic forging-press.

In Figs. 1, 2, and 3, C and D are two sets of feed-rollers at opposite sides of the anvil, each set being mounted in a frame 0 or (1. Both these frames are free to rise and fall either bodily or at the end only nearest the anvil, the effect in either case being substantially the same. The set of rollers 0 rise and fall bodily with a parallel motion, being for this purpose jointed to the ends of pairs of lever-arms e, fixed on transverse rock-shafts E E, to which are fixed other lever-arms f, to which the counter-weights F are attached. The rock-shafts have short lever-arms g fixed to them, which are connected together by the rod G. By this arrangement the rise an d fall of the frame 0 is uniform at all points, so that the frame always remains horizontal, the motion of the rollers in the upward direct-ion being limited by the counter-Weights coming to rest on supports. The frame at of the other set D is hinged upon a horizontal axis at the end (1 farthest from the anvil, while the free end is supported under the Weight of the ingot by hydraulic pressure acting on a ram H, connected by links h to a lever-arm I on a weigh-shaft K, to which other lever-arms k are fixed, and are connected by links to the end of the frame (1 nearest the anvil. The cylinder of the hydraulic ram is in free communication withthe accumulator.

Although the two sets of rollers O D are described as differently movable and differently counterweighted, the same arrangements may be employed for both. The rollers O are shown as driven through a train L of pinions and intermediate pinions from a shaft M.

To provide for the rising-and-falling motion of the frame 0 the shaft M is in this case geared with the first of the series of rollers 0 through an intermediate pinion m, pivoted at the joint connecting together pairs of radiuslinks m m pivoted on the shaft M and the roller-axis, respectively, so that the intermediate pinion is held constantly in gear with both. In the case of the set D the shaft M is the axis upon which the frame (1 Works.

For enabling the ingot to be pressed on the edge after being pressed on the fiat a turnover gear is applied to the rollers D, consisting of Y-shaped levers N, pivoted at n in the cross-bars of the frame (1 and projecting up between the rollers in position to act on the bloom lying thereon.

Both sets of rollers are provided with side fences P, and a similar set of turn-over levers N may be applied to the rollers C, if required;

but I have shown this set as provided with stationary intermediate fences O, dividing up the set of rollers in direction of its Width and serving to guide or support the bloom in its edgewise position. These fences are fixed to the cross-bars of the frame 0, and are connected together and to the side fences by top cross bars 0.

The mechanism, whereby the depression of whichever set of rollers C or D is for the time being acting as feeding-rollers is effected by the descent of the press-head B, consists of tappets R, mounted on the press-head, in combination with levers S, pivoted at t to brackets T, fixed to the columns of the press and provided with friction-rollers s, which bear The tappets R are vertical screwed rods sliding through guides on the press-head, and are adjustable as to height by screw collars or nuts worked by hand-wheel and bevel-pinions, as shown, so as to strike the levers S at the moment when the press-head begins to compress the ingot.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a hydraulic forging-press, the combination, with the press-head, and with rising and falling feed-roller frames, which, as well as the ingot thereon, are counterbalanced by weights or upheld by dydraulic pressure, of a lever interposed between the press-head and the roller-frame and adapted to be acted on by the press-head in its descent and to transmit a descending motion to the end of the feed-roller frame adjacent to the anvil concurrently with and to an extent corresponding to the bodily descent of the ingot while under compression, substantially as specified.

2. In a hydraulic forging-press, the combination, with the press-head, and with vertically-movable feed-rollers, which, as 'well as the ingot. thereon, are counterbalanced by weights or upheld by hydraulic pressure, of mechanism intermediate of the press-head and of the said rollers, said mechanism consistin g of an adjustable tappet carried by the press-head acting on a lever pivoted to a fixed support and bearing on the feed-roller frame, wherebythepress-head in its descent is caused to depress the feed-rollers concurrently with and to an extent corresponding to the bodily descent of the ingot while under compression between the press-head and anvil, substantially as specified.

CHARLES DAVY.

Witnesses:

ROBERT SNOW, RALPH CALLENETTE. 

